You can choose between 2-CPU or 4-CPU license, if you I/O wait is higher than 10%, go with the 4-CPU license. You can upgrade to 4-CPU license later if need.
The trial license is a full 2-CPU license for 15 days.

There is a known kernel bottle neck trigger by LiteSpeed when CPU/core count is very high. We are working on a solution now.
In the mean time, you should turn off "AIO" under server->"tuning" tab from LSWS console see if it help or not.

Sir I Have Total 8 proceesors in my dedicated server with centos 5.8 install and 8 gb ram

Vendor
GenuineIntel

Name
Intel(R) Xeon(R) CPU X3440 @ 2.53GHz

Speed
1197.000 MHz

Cache
8192 KB

and i have total 12 sites in my dedicated server 1 site is having daily 80000 visitors and other site no.2 is having 40000 visitor and other 10 sites is having 1000 user per day means 1x10=10000 users total 1,20,000+10,000= 1,30,000 total visitors im using litespeed 2 cpu license but not getting good spped as much i need so according to you howmay cpu license of litespeed is better for me.